Robin Williams is seen in a photo shot Dec. 24, 1987. Williams was found dead at his home in Marin County on Monday, Aug. 11, 2014. He was 63.

Photo: Fred Larson, The Chronicle

Robin Williams is seen in a photo shot Dec. 24, 1987. Williams was...

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Robin Williams, left, and Matt Damon appear in a scene from the movie "Good Will Hunting" in 1997.

Photo: George Kraychyk, AP

Robin Williams, left, and Matt Damon appear in a scene from the...

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Actor Robin Williams holds up his Oscar after winning in the Best Actor in a Supporting Role category during the 70th Academy Awards 23 March at the Shrine Auditorium in Los Angeles. Williams won for his role as a psychotherapist helping a troubled math genius in "Good Will Hunting."

Photo: Timothy A. Clary, AFP/Getty Images

Actor Robin Williams holds up his Oscar after winning in the Best...

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This is the first appearance of the alien Mork from Ork (Robin Wiliams, center), which earned him and Williams his own spin-off series, "Mork & Mindy". Mork came to Earth looking for someone to study and picked Richie (Ron Howard, right). Henry Winkler (Fonzie) also starred.

Photo: ABC PHOTO ARCHIVES, Getty Images

This is the first appearance of the alien Mork from Ork (Robin...

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The character of Mork, an alien from the planet of Ork, became so popular from an episode of "Happy Days" that it was spun-off into this series starring Robin Williams in the lead role (his first major acting break). The misfit alien was sent to study Earthlings by his fellow Orkans. Landing in a giant eggshell, near Boulder, Colorado, he was befriended by Mindy McConnell (Pam Dawber), who helped him adjust to Earth's strange ways.

Photo: JIM BRITT, Getty Images

The character of Mork, an alien from the planet of Ork, became so...

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Robin Williams, September 28, 1981. Williams was found dead at his home in Marin County on Monday, Aug. 11, 2014. He was 63.

Photo: Steve Ringman, The Chronicle

Robin Williams, September 28, 1981. Williams was found dead at his...

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Comedian Robin Williams, who will star in "The World According to Garp," is shown, July 21, 1982, in Los Angeles. (AP Photo)

Photo: Anonymous, Wire Photo

Comedian Robin Williams, who will star in "The World According to...

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Robin Williams and Wife Valerie Williams during Robin Williams After "Saturday Night Live" Taping in New York City - November 11, 1978 at NBC Studios in New York City, New York, United States.

Photo: Ron Galella, Getty Images

Robin Williams and Wife Valerie Williams during Robin Williams...

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Robin Williams on Chronicle Comedy Day - July 25, 1987 at the Polo Field in Golden Gate Park. Williams was found dead at his home in Marin County on Monday, Aug. 11, 2014. He was 63.

Photo: Deanne Fitzmaurice, The Chronicle

Robin Williams on Chronicle Comedy Day - July 25, 1987 at the Polo...

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Robin Williams was an aspiring comedian in 1978. Williams was found dead at his home in Marin County on Monday, Aug. 11, 2014. He was 63.

Photo: Ho

Robin Williams was an aspiring comedian in 1978. Williams was...

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Robin Williams at Gary Hart Fundraiser. St. Francis Hotel. Jun 4, 1984. Williams was found dead at his home in Marin County on Monday, Aug. 11, 2014. He was 63.

Photo: Chris Stewart, The Chronicle

Robin Williams at Gary Hart Fundraiser. St. Francis Hotel. Jun 4,...

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Robin Williams, at the age of 7, with his mother Laurie Williams.

Robin Williams, at the age of 7, with his mother Laurie Williams.

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Robin Williams, September 25, 1984.

Photo: Frederic Larson, The Chronicle

Robin Williams, September 25, 1984.

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Robin Williams with Will Durst (left) at Durst's campaign headquarters, after Durst lost a run for mayor. Dec. 9, 1987

Photo: Chronicle Archives

Robin Williams with Will Durst (left) at Durst's campaign...

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Robin Williams, October 4, 1980

Photo: Mike Maloney, The Chronicle

Robin Williams, October 4, 1980

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Robin Williams narrates Peter and the Wolf with a youth symphony on Dec. 12, 1993.

Photo: Brant Ward, The Chronicle

Robin Williams narrates Peter and the Wolf with a youth symphony on...

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Robin Williams in the 1980s.

Photo: Frederic Larson, The Chronicle

Robin Williams in the 1980s.

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Robin Williams is seen in a November, 1995 file photo.

Photo: Chris Stewart, SFC

Robin Williams is seen in a November, 1995 file photo.

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Jack Nicholson, right, and Robin Williams share a laugh as they pose with their Oscars at the 70th annual Academy Awards at the Shrine Auditorium in Los Angeles, Monday, March 23, 1998. Nicholson won for his role in "As Good As It Gets" and Williams for his role in "Good Will Hunting."

Photo: Reed Saxon, Associated Press

Jack Nicholson, right, and Robin Williams share a laugh as they...

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Holding their Oscar awards for acting, (L to R) Kim Basinger, Robin Williams, Helen Hunt and Jack Nicholson celebrate their success following the 70th Annual Academy Awards, March 23 in Los Angeles. Basinger won best supporting actress for her role in "L.A. Confidential," Williams won best supporting actor for "Good Will Hunting," Hunt won best actress for her role in "As Good As It Gets," and Nicholson won best actor for his role in "As Good As It Gets."

Listening to a few speeches just before the start of the race, from left, Dylan Casey, retired olympian, actor Robin Williams, and George Hincapie, professional bike racer.
A 25-mile Breakaway from Cancer charity bike ride which started at the Marina Green on Dec. 3, 2006.

Photo: Penni Gladstone, SFC

Listening to a few speeches just before the start of the race, from...

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Robin Williams as comedian-turned-candidate Tom Dobbs in "Man of the Year," 2006.

Photo: Photo Credit: Ava Gerlitz / Univ

Robin Williams as comedian-turned-candidate Tom Dobbs in "Man of...

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Awards recipients, director Spike Lee (L) and actor Robin Williams, laugh before the 50th San Francisco International Film Festival's Film Society Awards in San Francisco, California, May 3, 2007.

Comedian and actor Robin Williams appears on MTV's Total Request Live, Thursday, April 27, 2006 at MTV studios in New York City. Williams was found dead at his home in Marin County on Monday, Aug. 11, 2014. He was 63.

Photo: Stephen Chernin, AP

Comedian and actor Robin Williams appears on MTV's Total Request...

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Comedians Robin Williams and Billy Crystal were in the Giants dugout before a game in 2007.

Comedians Robin Williams (left) and Mort Sahl (right) attend opening the opening night party of the Mill Valley Film Festival at the Outdoor Art Club in Mill Valley, California, on Thursday, October 6, 2011.

Photo: Liz Hafalia, The Chronicle

Comedians Robin Williams (left) and Mort Sahl (right) attend...

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Robin Williams helped out Larry Page Google's Presadent with explaning some of the computer terms at the Consumer Electronics Show in Las Vegas.

Photo: Kurt Rogers, SFC

Robin Williams helped out Larry Page Google's Presadent with...

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Sean Penn (left) with actor Robin Williams and comedian Frank Ferrante at Teatro ZinZanni for a fundraiser in 2010.

Photo: Catherine Bigelow, Special To The Chronicle

Sean Penn (left) with actor Robin Williams and comedian Frank...

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The San Francisco Film Society hosted its 50th Awards Gala at the St. Francis Hotel with Robin Williams in 2010.

Photo: Pamela Gentile, Freelance

The San Francisco Film Society hosted its 50th Awards Gala at the...

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The San Francisco Film Society hosted its 50th Awards Gala at the St. Francis Hotel in 2010.
From left: Comedian Bonnie Hunt presented the Film Award to Robin Williams.

Photo: Drew Altizer, Freelance

The San Francisco Film Society hosted its 50th Awards Gala at the...

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In this file photo from Thursday, Oct. 7, 2010, actor Robin Williams hugs San Francisco Giants mascot Lou Seal during the first inning of Game 1 of baseball's National League Division Series in San Francisco.

Photo: Ben Margot, Wire Photo

In this file photo from Thursday, Oct. 7, 2010, actor Robin...

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Robin Williams and Tony Bennett pose backstage at the hit play "Bengal Tiger At The Baghdad Zoo" on Broadway at The Richard Rogers Theater on May 4, 2011 in New York City.

Photo: Bruce Glikas, Getty Images

Robin Williams and Tony Bennett pose backstage at the hit play...

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Robin Williams, with his daughter, Zelda Williams, right, and third wife Susan Schneider arrive at the premiere of "Happy Feet Two" at Grauman's Chinese Theater in 2011.

Photo: Katy Winn, Wire Photo

Robin Williams, with his daughter, Zelda Williams, right, and third...

Robin Williams was diagnosed with Parkinson's disease before his death but was not yet ready to share this information with the public, his wife, Susan Schneider, said in a statement Thursday, the Associated Press reports.

The statement is posted in its entirety below:

"Robin spent so much of his life helping others. Whether he was entertaining millions on stage, film or television, our troops on the frontlines, or comforting a sick child — Robin wanted us to laugh and to feel less afraid.

"Since his passing, all of us who loved Robin have found some solace in the tremendous outpouring of affection and admiration for him from the millions of people whose lives he touched. His greatest legacy, besides his three children, is the joy and happiness he offered to others, particularly to those fighting personal battles.

"Robin's sobriety was intact and he was brave as he struggled with his own battles of depression, anxiety as well as early stages of Parkinson's Disease, which he was not yet ready to share publicly.

"It is our hope in the wake of Robin's tragic passing, that others will find the strength to seek the care and support they need to treat whatever battles they are facing so they may feel less afraid."